• Title/Summary/Keyword: Natural

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Effect of Molecular Structure on Liquid Crystalline Properties (1); 1,10-Bis(p-2-,3-,4,-halogenophenoxycarbonyl)phenoxydecane (액정성에 대한 분자 구조의 효과 (1); 1,10-Bis(p-2-,3-,4-halogenophenoxycarbonyl)phenoxydecane)

A Comparative Experiment on the Hydrate Structures I and II for the Solid Transportation of Natural Gas (천연가스 고체화수송을 위한 하이드레이트 구조 I과 II에 대한 비교실험)

  • 김남진;김종보
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.15 no.8
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    • pp.674-682
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    • 2003

  • Natural gas hydrate typically contains 85 wt.% water and 15 wt.% natural gas, and commonly belongs to cubic structure I and II. Also, 1m$^3$ hydrate of natural gas can be decomposed to 200 m$^3$ natural gas at standard condition. If this characteristic of hydrate is reversely utilized, natural gas is fixed into water and produced to hydrate. Therefore the hydrate is great as a means to transport and store natural gas. So, the tests were performed on the formation of natural gas hydrate is governed by the pressure, temperature, gas composition etc. The results show that the equilibrium pressure of structure II is approximately 65% lower and the solubility is about 3 times higher than structure I. Also if the subcoolings of structure I and structure II are more than 9 K and 11 K respectively, the hydrates are rapidly formed.

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Discriminatian of Cnidium Rhizame using PCR-mediated RFLP

  • Cho, So-Yean;Ze, Keum-Ryon;Seong, Rack-Seon;Lee, Jong-Pill;Ju, Young-Park;Park, Sang-Yong;Jung, Young-Ja;Cho, Chang-Hee;Ha, Kwang-Won;Suh, Young-Bae
    • Proceedings of the PSK Conference
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    • 2002.10a
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    • pp.367.2-367.2
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    • 2002

  • Cnidium Rhizome is a frequently prescribed herbal medicine in Korea, Japan as well as China, which has been successfully used in these countries for the treatment of diseases related to. gynecology, blood circulations and dental troublers in the name of 천궁. And it is circulated as the same chinese character, which is 천궁, although original plants are different as Cnidium officinale in pharmacopoeia of Korea or Japan and Ligusticum chuanxiong Hort. In that of China. (omitted)

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